I have one client with recurring problems when using a PPTP tunnel. The connection works for a few minutes but then it is interrupted right in the middle of activity. Reconnection attempts fail with error 619 for several minutes and some time later it works again (for a few minutes)
This is how the session ends according to logs:
2010:11:26-12:03:41 firewall pptpd[23325]: CTRL: Received PPTP Control Message (type: 5)
2010:11:26-12:03:41 firewall pptpd[23325]: CTRL: Made a ECHO RPLY packet
2010:11:26-12:03:41 firewall pptpd[23325]: CTRL: I wrote 20 bytes to the client.
2010:11:26-12:03:41 firewall pptpd[23325]: CTRL: Sent packet to client
2010:11:26-12:03:49 firewall pptpd[23325]: GRE: read(fd=7,buffer=80505a0,len=8260) from network failed: status = -1 error = Protocol not available
2010:11:26-12:03:49 firewall pptpd[23325]: CTRL: GRE read or PTY write failed (gre,pty)=(7,6)
2010:11:26-12:03:49 firewall pptpd[23325]: CTRL: Reaping child PPP[23326]
2010:11:26-12:03:49 firewall pppd-pptp[23326]: Modem hangup
2010:11:26-12:03:49 firewall pppd-pptp[23326]: Connect time 4.0 minutes.
2010:11:26-12:03:49 firewall pppd-pptp[23326]: Sent 371329 bytes, received 125194 bytes.
2010:11:26-12:03:49 firewall pppd-pptp[23326]: Script /etc/ppp/ip-down started (pid 23748)
2010:11:26-12:03:49 firewall pppd-pptp[23326]: MPPE disabled
2010:11:26-12:03:49 firewall pppd-pptp[23326]: sent [LCP TermReq id=0x6 "MPPE disabled"]
2010:11:26-12:03:49 firewall pppd-pptp[23326]: Connection terminated.
2010:11:26-12:03:49 firewall pppd-pptp[23326]: Waiting for 1 child processes...
2010:11:26-12:03:49 firewall pppd-pptp[23326]: script /etc/ppp/ip-down, pid 23748
2010:11:26-12:03:50 firewall pppd-pptp[23748]: id="2202" severity="info" sys="SecureNet" sub="vpn" event="Connection terminated" username="***x" variant="pptp" srcip="88.xx.xx.xx" virtual_ip="10.xx.xx.xx"
2010:11:26-12:03:50 firewall pppd-pptp[23326]: Script /etc/ppp/ip-down finished (pid 23748), status = 0x0
2010:11:26-12:03:50 firewall pppd-pptp[23326]: Exit.
2010:11:26-12:03:50 firewall pptpd[23325]: CTRL: Client 88.xx.xx.xx control connection finished
2010:11:26-12:03:50 firewall pptpd[23325]: CTRL: Exiting now
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